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Empty bed residence time regulates synergistic effect of algae-bacteria consortia in volatile organic compounds treatment: Performance and mechanism

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Algal Research 2025年 90卷

作者： Wei Wang Zhuowei Cheng Jianmeng Chen Dongzhi Chen Feifei Cao Jiade Wang Zhaoyang Lu College of Environment Zhejiang University of Technology Hangzhou 310014 China Zhejiang Key Laboratory of Low-carbon Control Technology for Industrial Pollution Hangzhou 310014 China School of Environmental and Natural Resources Zhejiang University of Science and Technology Hangzhou 310023 China School of Petrochemical Engineering & Environment Zhejiang Ocean University Zhoushan 316022 China Hangzhou Chuhuan Science and Technology Co. Ltd. Hangzhou Zhejiang Province 310015 China NJU environmental technologies of Nanjing University Jiangsu co. LTD Nanjing 210093 China

Biological treatment technology utilizing algal-bacteria consortium (ABC) has shown remarkable effectiveness in synergistically reducing emissions of volatile organic compounds (VOCs) and CO 2 . However, the impact of empty bed residence time (EBRT) on the performance and underlying synergistic mechanisms of the ABC has remained unclear. In this study, we systematically compared an algal-bacterial airlift photobioreactor (PB) with a conventional bacterial airlift bioreactor (CB) under varying EBRT conditions. At longer EBRTs of 51 and 34 s, both reactors achieved nearly 100 % removal efficiency (RE) for n -butyl acetate. Simultaneously, the activity of the Rubisco enzyme increased substantially, enhancing the CO 2 assimilation efficiency ( R CO 2 ) of the microalgae, which peaked at 92.65 ± 0.88 %. At shorter EBRTs of 26 and 20 s, the PB exhibited n -butyl acetate REs approximately 1.11 and 1.46 times higher than the CB, respectively. Notably, shorter EBRT stimulated the ABC to secrete more extracellular polymeric substances (EPS) and promoted the formation of more complex microbial communities, thereby ensuring more stable and efficient pollutant removal. It is demonstrated in this work that synergistic reductions of VOCs and CO 2 across various environmental conditions can be effectively achieved by the ABC, providing valuable theoretical insights for the development of gas bio-purification technologies.

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Interactions between microplastics/nanoplastics and vascular plants

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Environmental pollution (Barking, Essex : 1987) 2021年 290卷 117999页

作者： Lingshi Yin Xiaofeng Wen Danlian Huang Chunyan Du Rui Deng Zhenyu Zhou Jiaxi Tao Ruijin Li Wei Zhou Zeyu Wang Haojie Chen College of Environmental Science and Engineering Hunan University Changsha Hunan 410082 China Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha Hunan 410082 China. School of Hydraulic Engineering Changsha University of Science and Technology Changsha 410114 China Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province Changsha 410114 China Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha 410114 China. Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha Hunan 410082 China. Electronic address: huangdanlian@***. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province Changsha 410114 China.

Microplastics and nanoplastics are distributed in the environments universally. The interrelationship between vascular plants and micro/nanoplastics began to attract attention in recent years. Based on the relevant literatures collected from various databases, this review focuses on two topics: 1) the effect of vascular plants on the fate of micro/nanoplastics; 2) the effects of micro/nanoplastics on vascular plants. The review of the available studies reveals that vascular plants can act as sinks for microplastics and nanoplastics as their surfaces can adsorb these plastics; moreover, nanoplastics can be internalized by plants. Plastics on the surfaces and in the interiors of vascular plants can cause various phytotoxicity effects, including impacts on growth, photosynthesis, and oxidative stress. Furthermore, the results and mechanisms of phytotoxicity effects caused by microplastics or nanoplastics can be very different. However, knowledge gaps still exist in the relationships between micro/nanoplastics and vascular plants based on the analysis of available studies; thus, potential subjects for future studies were proposed, including the fates, analysis methods, influencing factors, mechanisms of phytotoxicity, and further influences of microplastics and nanoplastics in the vascular plant ecosystems. This study presents a review of micro/nanoplastics-vascular plant research and reaches a basis for future research.

关键词： Fate Microplastics Nanoplastics Phytotoxicity Vascular plants

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Exclusive microbially driven autotrophic iron-dependent denitrification in a reactor inoculated with activated sludge

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Water Research 2020年第0期170卷 115300-000页

作者： Tian, Tian Zhou, Ke Xuan, Liang Zhang, Jing-Xiao Li, Yu-Sheng Liu, Dong-Feng Yu, Han-Qing CAS Key Laboratory of Urban Pollutant Conversion Department of Applied Chemistry University of Science and Technology of China Hefei 230026 China School of Resources & Environmental Engineering Hefei University of Technology Hefei 230009 China School of Environmental Science & Engineering State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China

Autotrophic iron-dependent denitrification (AIDD) is arising as a promising process for nitrogen removal from wastewater with a low carbon to nitrogen ratio. However, there is still a debate about the existence of such a process in activated sludge systems. This work provides evidence and elucidated the feasibility of autotrophic Fe(II)-oxidizing nitrate-reducing culture for nitrogen removal by long-term reactor operation, batch experimental verification, unstructured kinetic modeling and microbial community analyses. A relatively stable nitrate removal rate was achieved coupled with the oxidation of ferrous ions in 3-month operation of reactor. The kinetic modeling suggests that the iron oxidation was a growth-associated process in AIDD. Utilization of extracellular polymeric substances (and/or soluble microbial products) as electron donor for denitrification by heterotrophic denitrifiers was not mainly responsible for nitrogen removal in the reactor. After long-term operation of the reactor with activated sludge as inoculum, the enrichment culture KS-like consortium, dominated by Fe(II) oxidizer, Gallionellaceae, was successfully acclimated for autotrophic Fe(II)-oxidizing nitrate reduction. This work extents our understanding about the existence of such an autotrophic Fe(II)-oxidizing nitrate-reducing culture in both natural and engineered systems, and opens a door for its potential application in wastewater treatment. © 2019 Elsevier Ltd

关键词： Activated sludge Autotrophic iron-dependent denitrification (AIDD) Gallionellaceae Kinetic modeling Wastewater treatment

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Fabrication of CuS/BiVO 4 (0 4 0) binary heterojunction photocatalysts with enhanced photocatalytic activity for Ciprofloxacin degradation and mechanism insight

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Chemical Engineering Journal 2019年 358卷 891-902页

作者： Cui Lai Mingming Zhang Bisheng Li Danlian Huang Guangming Zeng Lei Qin Xigui Liu Huan Yi Min Cheng Ling Li Zhang Chen Liang Chen College of Environmental Science and Engineering Hunan University Changsha 410082 Hunan PR China Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 Hunan PR China Hunan Province Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection PR China Faculty of Life Science and Technology Central South University of Forestry and Technology Changsha Hunan 410004 PR China

The photocatalytic performance of BiVO 4 is restricted via the fast recombination of photogenerated carriers and low visible light absorption. Fabricating of CuS/BiVO 4 (0 4 0) binary heterogeneous photocatalysts by in suit growing of CuS on the surface of BiVO 4 can enhance the absorption range of visible light and the separation of photogenerated carriers. Simultaneously, CuS/BiVO 4 heterogeneous can provide large surface area and more active sites. The photocatalytic activity of CuS/BiVO 4 composites for Ciprofloxacin (CIP) removal was examined under visible light irradiation. The optimal mass ratio of CuS to BiVO 4 was determined to be 7%, and the first-order kinetic constant of CIP degradation over 7% CuS/BiVO 4 (0.02151 min −1 ) was 2.59 and 16.54 times of pristine BiVO 4 and CuS, respectively. The improved photodegradation efficiency is attributed to the effective separation of photogenerated carriers via formation of p-n heterojunction. The high photostability of as-prepared CuS/BiVO 4 heterojunction photocatalysts was explored by four successive cycling experiments. The detailed mechanism for improved photocatalytic performance was discussed and the possible degradation pathway of CIP was measured by Liquid Chromatography-Mass/Mass Spectrometry. The trapping experiments and electron spin resonance (ESR) spin-trapping tests confirm that holes are main active species in photocatalytic degradation of CIP.

关键词： Photocatalysis Heterojunction CuS/BiVO 4 Photocatalytic activity Photocatalytic mechanism

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Interbasin Trade Worsens the State of Freshwater Fish Biodiversity in China

SSRN

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SSRN 2024年

作者： Wang, Changbo Zhang, E. Wang, Yafei Chang, Yuan Zhang, Pengpeng Chen, Xiao Pang, Mingyue Yu, Han Wang, Qunwei Zhang, Lixiao Zhou, Dequn Lenzen, Manfred Malik, Arunima Zha, Donglan Zhang, Xuejun Feng, Meili Mi, Zhifu College of Economics and Management Research Center for Soft Energy Science Nanjing University of Aeronautics and Astronautics Nanjing210016 China Institute of Hydrobiology Chinese Academy of Sciences Hubei Province Wuhan430072 China School of Statistics Institute of National Accounts Beijing Normal University Beijing100875 China School of Management Science and Engineering Central University of Finance and Economics Beijing100081 China School of Geographical Sciences Hebei Normal University Shijiazhuang050024 China College of Animal Science and Technology Anhui Agricultural University Hefei230036 China Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment Ministry of Education Chongqing University Chongqing400045 China Department of Natural Geography Resources and Environment Lanzhou University of Finance and Economic Lanzhou730101 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing100875 China School of Physics A28 The University of Sydney NSW2006 Australia China Institute of Water Resources and Hydropower Research Beijing100038 China School of Geographical Sciences Faculty of Science and Engineering University of Nottingham Ningbo China Ningbo315100 China The Bartlett School of Sustainable Construction University College London LondonWC1E7HB United Kingdom

Human economic activities pose a severe threat to freshwater fish biodiversity in different river basins. Trade makes the impact more mysterious and complex because local threats to biodiversity can be caused by distant demand or primary inputs. Unawareness of threats caused by interbasin trade and the complexity of interbasin supply chain have confounded local efforts to reduce impacts. To reveal the causal relationship between trade and freshwater fishes, we developed a river-basin economic transaction model that is applied to mainland China―home to 9% of the world’s freshwater fish species. Here, we show that interbasin trade induced by final demand contributes 74% of China’s freshwater fish biodiversity threats. Economically developed river basins (e.g., Huaihe River) are the main beneficiaries of interbasin trade, at the cost of biodiversity deterioration in economically underdeveloped river basins (e.g., upper Pearl River), especially when trade occurs between distant basins. Our findings highlight the significance of the shift in governance from administrative divisions to river basins and control measures in different stages of economic supply chains to mitigate freshwater fish biodiversity threats. © 2024, The Authors. All rights reserved.

关键词： Commerce

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Microplastics retention by reeds in freshwater environment

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The Science of the total environment 2021年 790卷 148200页

作者： Lingshi Yin Xiaofeng Wen Danlian Huang Guangming Zeng Rui Deng Ruyi Liu Zhenyu Zhou Jiaxi Tao Ruihao Xiao Heming Pan College of Environmental Science and Engineering Hunan University Changsha Hunan 410082 China Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha Hunan 410082 China. School of Hydraulic Engineering Changsha University of Science and Technology Changsha 410114 China Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province Changsha 410114 China. Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha Hunan 410082 China. Electronic address: huangdanlian@***. Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha Hunan 410082 China. Electronic address: zgming@***. School of Hydraulic Engineering Changsha University of Science and Technology Changsha 410114 China.

Microplastic pollution has recently gained increasing attention. The accumulation of microplastics in plants has been confirmed in the marine environment. However, the extent of the microplastic retention in freshwater plants is still unknown. In this study, sediment and plant samples from six reed farms in the wetland of East Dongting Lake were collected and analyzed. The abundance of microplastics in the sediment of reed farms varied from 125.7 to 1219.5 items/kg dry weight (dw), with an average of 511.2 ± 295.0 items/kg. Moreover, different levels of microplastic abundance were found in reeds from 0 to 14 items/individual. The abundance of microplastics in sediment samples was moderate compared to that worldwide and higher than that in other regions of Dongting Lake. The microplastic pollution level was significantly higher in the reed vegetation belt than that in other sampling positions. On the basis of the distribution and characteristics of the collected microplastics, lake water and fishery are suggested as important sources of microplastics. Furthermore, the factors influencing microplastic retention in the reeds are discussed. This study, as the first direct evidence demonstrating that freshwater reeds tend to accumulate microplastics, constitutes valuable reference for future research.

关键词： Microplastics Plant pollution Reed Sediment

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The study of migration velocity of Cs-135 and Se-79 in intact rock

The study of migration velocity of Cs-135 and Se-79 in intac...

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第二届制造技术，材料和化学工程国际学术会议（MTMCE 2019）

作者： H LING L CHEN W M CHEN L YUN Beijing Research Institute of Uranium Geology CNNC Hunan Provincial Key Laboratory of Pollution Control and Resources Technology University of South China

The migration characteristics of highly mobile nuclides in natural barrier are the key concerns in the long-term safety assessment of geological disposal facilities. This paper focused on typical granite in Beishan area for geological disposal of high-level radioactive waste, and established a computational model for the release and migrate of nuclides after closure of repository by GoldSim. The migration characteristics of Cs-135 and Se-79 were analyzed by Monte Carlo stochastic simulation. The results show that the migration characteristics of Cs-135 and Se-79 in intact rock are direct influenced by hydraulic conductivity and hydraulic gradient, the migration velocity are 2.47×10 m/a and 9.61×10 m/a when the hydraulic conductivity correspond to 5.74 ×10 m/s. The analysis of the results shows that the migration characteristics can provide feedback guidance for the site selection and design of the disposal repository.

关键词： The study of migration velocity of Cs-135 and Se-79 in intact rock

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Rational design 2D/2D BiOBr/CDs/g-C 3 N 4 Z-scheme heterojunction photocatalyst with carbon dots as solid-state electron mediators for enhanced visible and NIR photocatalytic activity: Kinetics, intermediates, and mechanism insight

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Journal of Catalysis 2019年 369卷 469-481页

作者： Mingming Zhang Cui Lai Bisheng Li Danlian Huang Guangming Zeng Piao Xu Lei Qin Shiyu Liu Xigui Liu Huan Yi Minfang Li Chengcheng Chu Zhang Chen College of Environmental Science and Engineering Hunan University Changsha 410082 Hunan People’s Republic of China Key Laboratory of Environmental Biology and Pollution Control Hunan University Ministry of Education Changsha 410082 Hunan People’s Republic of China Hunan Province Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection People’s Republic of China

Rapid recombination of photogenerated carriers and narrow visible light absorption range are two main defects in graphitic carbon nitride (g-C 3 N 4 )-based photocatalysts. To address these problems, construction of Z-scheme 2D/2D BiOBr/CDs/g-C 3 N 4 heterojunction photocatalysts with carbon dots as solid-state electron mediators has been investigated. The resultant BiOBr/CDs/g-C 3 N 4 hybrids exhibits remarkable interfacial charge transfer abilities and a broadened solar light absorption range owing to the short charge transport distance and the up-converted photoluminescence character of CDs. Simultaneously, the enhanced specific surface area and nanosheet structure impart more active sites to BiOBr/CDs/g-C 3 N 4 composites. As a result, BiOBr/CDs/g-C 3 N 4 composites reveal significant enhancement in the activity of photodegradation of ciprofloxacin (CIP) and tetracycline (TC) under visible and near infrared (NIR) light irradiation. Moreover, the photodegradation efficiency of BiOBr/CDs/g-C 3 N 4 hybrids was significantly enhanced over that of pristine BiOBr nanosheets and g-C 3 N 4 ultrathin nanosheets. The photocatalytic mechanism is expounded according to free radical capture experiments and electron spin resonance spin-trapping tests and the photodegradation intermediates of CIP were detected by liquid chromatography–mass/mass spectrometry. Moreover, BiOBr/CDs/g-C 3 N 4 composites show excellent photostability and reusability after four runs for CIP degradation.

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Compensation effects of coated cysteamine on meat quality, amino acid composition, fatty acid composition, mineral content in dorsal muscle and serum biochemical indices in finishing pigs offered reduced trace minerals diet

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Science China(Life Sciences) 2019年第11期62卷 1550-1553页

作者： Miaomiao Bai Hongnan Liu Kang Xu Xiaofeng Zhang Baichuan Deng Chengquan Tan Jinping Deng Pingping Bing Yulong Yin National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production Hunan Province Key Laboratory of Animal Nutritional Physiology and Metabolic ProcessHunan Provincial Engineering Research Center of Healthy LivestockKey Laboratory of Agro-ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125China College of Animal Science South China Agricultural UniversityGuangzhou 510642China Hunan Co-Innovation Center of Animal Production Safety Changsha 410128China Hangzhou King Techina Technology Company Academician Expert Workstation Hangzhou King Techina Technology Co.Ltd.Hangzhou 311107China Academics Working Station Changsha Medical UniversityChangsha 410219China

Dear *** mineral elements(ME)and amino acids have been demonstrated to be essential bioelements in animal *** there is a deficiency in ME,a number of biological functions in animals may be affected,including physical growth,psychomotor development,and *** of pig diets with ME is known to improve the animals'growth,reproduction,and their immunity against oxidative stress and cell damage.

关键词： indices oxidative finishing

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Unravelling the interfacial charge migration pathway at atomic level in 2D/2D interfacial Schottky heterojunction for visible-light-driven molecular oxygen activation

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Applied Catalysis B: Environmental 2020年第0期266卷 118650-000页

作者： Li, Bisheng Liu, Shiyu Lai, Cui Zeng, Guangming Zhang, Mingming Zhou, Mingzhu Huang, Danlian Qin, Lei Liu, Xigui Li, Zhongwu An, Ning Xu, Fuhang Yi, Huan Zhang, Yujin Chen, Liang College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 Hunan China Institute of Nanochemistry and Nanobiology Shanghai University Shanghai 200444 China College of Resources and Environment Science Hunan Normal University Changsha 410082 China Faculty of Life Science and Technology Central South University of Forestry and Technology Changsha 410004 Hunan China

Visible-light-driven molecular oxygen activation (MOA) is deemed as the potential route to enhance oxidation capacity of molecular oxygen, while activation efficiency is significantly impeded thanks to the deficient charge carrier separation and transfer. In this work, an atomic scale 2D/2D Schottky heterojunction is prepared using titanium carbide as 2D platform for in situ growth of 2D ultrathin bismuth molybdate nanosheet through anaerobically hydrothermal conditions. This 2D/2D Schottky heterojunction displays high performance for MOA, which is 5.56-fold higher than pristine one. The excellent activation efficiency is originated from ultrahigh charge carrier transfer channel, in which the surface charge transfer efficiency is enhanced (30.73 % vs 18.45 %) and the surface recombination constant is decreased (0.0019 s⁻¹ vs 0.0031 s⁻¹) compared to pristine one. The mechanism of photocatalytic MOA is unearthed based on experiment results and various characterizations. This study shows the great potential of atomic scale 2D/2D Schottky heterojunction in photocatalytic MOA. © 2020 Elsevier B.V.

关键词： 2D/2D Schottky heterojunction Mechanism Molecular oxygen activation Surface charge transfer efficiency Surface recombination constant

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